Eyecandy is more for text effects, while Blade Pro is for nice surfaces, but you can also use if for text :)
Rayflect has some really cool plug-ins, although i think theyre owned by Ulead now. Look up 4 Seasons (makes nice perspective backrounds, skys, waters), Gif-X, and i think the other is called Particle-X ??
Andromedia is big on plugins too...
Oh yesh, KPT Tools (6 is the latest?) has very nice interface and coolio effects!